Machine for tapping nuts



(N0 M del. 3 Sheets-Sheet 1.

H.. A.' HARVEY.

MACHINE FOR TAPPING NUTS.

NO. 251,875. Patented Jan. 3,1882.

' (No Model.) 3Sheets-Shee12.

' H. A. HARVEY.

MACHINE FOR TAPPING NUTS. v No, 251,875, I Patented Jan. 3,1882.

Figure 0"- 3 SheetsSheet 3.

H. ALHARVEY. MACHINE FOR TAPPING NUTS.-

(No Model.)

Patented J an. "3, v 88 Z- i i A wwwam' y UNITED STATES PATENT GFFIC.

HAYWARD A.-HARVEY, OF ORANGE, NEW JERSEY.

MACHINE FOR TAPPING NUTS.

I SPECIFICATION forming part of Letters Patent No. 251,875, dated January 23,1882.

' Application filed May 27, 1881. (No model) To all whom it may concern:

Be it known that I, HAYWARD -A. HARVEY, of Orange, New Jersey, have invented certain Improvements in Machines for Tapping Nuts, of which the following is a specification.

My improvements are especially designed for automatically cutting the threads in nuts by the use of two longitudinally-reciprocating revolving-taps arranged in aligumentwith each other, one of. the taps being for the purpose of finishing threads which have been previously cut by the other tap. i

In theaccompanying drawings, illustrating a machine embodying my improvements,Fig- .ure 1 is a top view. Fig. 2 is a side elevation.

Fig. 3 is a horizontal projection of the periphery of the reversing-cam, of which Fig. 4 is a side view. Fig. 5 is a side view of the cam for controlling the movements of the primary tap. Fig. 6 is a side view of the cam for imparting the final backward movement to the secondary I tap, and also by the portion of itsperiphery shown inFig. 7 operating the feed-slide, by means of which the column of nuts in the tube is sustained,while the finished nut is allowed todrop. Fig. Sis a transverse vertical section of the machine through the line w m on Fig. 2. Fig. 9 is a transverse vertical section of the machine through the line 3 y on Fig. 2. Fig. 10.is a transverse vertical section of the lower end of the feed-tube, feed-slide, 850. Fig. 11 is a side elevation of the feed-slide, showing the feed-tube in vertical section through theline z 2 on Fig. 10. Figs. 12, 13, and 14 are views in detail of the cam for controlling the movements of the taps, showing means of adjusting the operative parts of the machine. The drawings represent a substantial bedpiece, A, provided with suitable standards, A,

affording the bearings for the shaftin g. Power is applied to the driving-pulley B, the shaft B of which is provided with the worm b, which meshes into the worm-wheel b, keyed .to-the cam-shaft 0. Power is also transmitted from the driving-shaft B, by means of the bevelwheels B and B to the counter-shaft D,from which it is transmitted by means of the pinion d to the counter-shafts DD upon which the reversing-gear is supported.

The reversing-gear is of ordinary construction, being provided with longitudinally-mov- E, afiixed to the free end d of the yoke d The primary die-arbor F is rotated in one direction or the other, as the case may be, by

power transmitted from one of the wide gears D to the pinion f. The die-arborF is adapted to slide longitudinally in its bearings, and is pressed toward the center of the machine by the expanding spiral spring F.

. The primary tap H isinserted in the end F of the die-arbor F, and is in proper alignment to enter the holein the lowermost nut-blank, h, of the column of nut-blanks held in the feeding-tube I.

I In order to effect the positive engagement of the primary tap H with the nut-blank in which the'threads are to be cut, Iprovide the die-arbor F with the fixed disk F which is at the proper time engaged by the adjustable face j of the cam J. The object of this adj ustability is to make the gain of this face of the cam J correspond with the pitch of the thread upon the tap H. After the tap H has fairly entered and commenced to cut the thread the further inward movement of the die-arborF is effected by the hold of the tap on the nut which is being cut. After the tap has made the requisite number of revolutions to enable itto out through the nut-blank the cam E operates the yoke d and reverses the direction of the rotation of the die-arbor F, which then movesoutward as the tap unscrews from the nut.

In order to effect the complete removal of the tap H from contact with the nut, I provide projection J upon the cam J, which at the appropriate time engages the face of the disk'F and as the cam J rotates pushes the die-arbor F back.

The cam-shaft 0 extends across the machine, and is provided with the cam Kfor engaging at the proper time a disk, Z, affixed to the secondary die-arbor L. The die-arbor L is pressed toward the center of the machine by the expanding spiral spring L, and upon one end carries the secondary or finishing tap L There isno need of positive motion for forcing the finishing-tap into the nut upon which it is to work, because the thread has already been cut therein by the primary die. The

spiral spring L therefore is sufficient to accomplish this purpose, and the cam K is only required to completely withdraw the secondary tap L from the finished nut and hold it back far enough to allow the primary tap to pass clear through the next nut which is operated upon, and so on.

The rotation of the die-arbor L is effected by power transmitted to the pinion L from the wide gear L affixed to the counter-shaft D, which also extends across from one end of the machine to the other.

The nut-blan ks are fed to the machine through the vertical tube M, and are prevented from dropping out of the bottom of the vertical tube M by the check-slide N, which, during the operation of tapping the nuts,-stands still beneath the lower end of the tube M. When the nut has been finished the check-slide N is withdrawn from the bottom of the tube by means of the cam 70, affixed to the side of the cam K, and acting upon the cam-pin 70, inserted in the horizontal bar a, which carries the checkslide.

In order to prevent the column of nut-blanks contained in the tube M from falling when the check-sli de is withdrawn from the bottom of the tube, the bar a of the check-slideis provided with the taper pin N, which, as the checkslide is withdrawn, enters through the hole in the side of the tube M into the nut-blank, resting upon the top of the nut which has been finished and is to be discharged. The column of nut-blanks in the tube is thus prevented from falling until the check-slide has returned to its position beneath the lower end of the tube.

By this organization of the machine its operations are performed automatically. Each nutblank in succession is brought into position between the ends of the two taps with its hole in alignment with them, and is held in the path which they successively traverse while the primary tap does the preliminary work of cutting the thread and retires, and the finishingtap entering upon the opposite side of the blank performs the work of finishing the thread. When the finishing-tap in its turn has retired, the finished nut is released and discharged, and another nut-blank is then presented for a like action of the taps successively.

I claim as my invention In a machine for tapping nuts, two taps arranged in longitudinal alignment, for acting successively on the nut-blank from opposite sides thereof, and having the capacity of reciprocatin g endwise movement, and means for rotating and reversingthe directionof rotation of the two taps, in combination with a feedingtube or conveyer for a nut-blank, and means for holding the nut-blank in the path traversed by the tap successively, and means for discharging the finished nut after the two taps have operated upon it from opposite sides, substantially as set forth.

H. A. HARVEY.

Witnesses:

M. L. ADAMS, WM. RUMBLE. 

